CVE-2015-8953

Impact:
Moderate
Public Date:
2016-08-23
CWE:
CWE-772
Bugzilla:
1367814: CVE-2015-8953 kernel: overlayfs: Double dentry reference leak in copy-up failure
A flaw was found in the Linux kernel's implementation of overlayfs. An attacker can leak file resources in the system by opening a large file with write permissions on a overlay filesystem that is insufficient to deal with the size of the write. When unmounting the underlying device, the system is unable to free an inode and this will consume resources. Repeating this for all available inodes and memory will create a denial of service situation.

Find out more about CVE-2015-8953 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as the code with the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 5.4
Base Metrics AV:L/AC:M/Au:N/C:P/I:N/A:C
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact Complete

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 6.1
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Impact None
Availability Impact High

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 realtime-kernel Will not fix
Red Hat Enterprise Linux 7 kernel-rt Will not fix
Red Hat Enterprise Linux 7 kernel Will not fix
Red Hat Enterprise Linux 6 kernel Not affected
Red Hat Enterprise Linux 5 kernel Not affected

Acknowledgements

This issue was discovered by CAI Qian (Red Hat Engineering).

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